The Hatter's watch nicely illustrates the effect of idiosynracy in system design. Really, a watch could provide any number of features, but most watches designed for people put a high priority on telling the correct time of day. Thus, the Hatter's watch is an excellent example of bad human engineering. By human engineering we mean "the selection among design alternatives so as to relate to people." Carroll's stopped watch is the ultimate in poor human engineering because the user must do all the work.